Class GrandchildPost

Lib/test/test_patma.py:96–97

        class ChildPost(Parent):
            pass
        class GrandchildPost(ChildPost):
            pass
        self.assertEqual(self.check_sequence_then_mapping(Parent()), "map")
        self.assertEqual(self.check_sequence_then_mapping(ChildPre()), "map")
        self.assertEqual(self.check_sequence_then_mapping(GrandchildPre()), "map")